I have a 10k generator set up with propane on a 500gal tank. I’ve gone back and fourth with generator size. My 10k will run everything in the house, just not all at once. If you want hot water, turn off the AC. Those are the only two energy guzzlers that I have to worry about. I guess if I had the oven and a couple burners going at once I would have to consider that a big draw as well. Even the 10k uses a decent amount of propane though. I recently got a smaller portable generator that will run everything except the AC, but will need to be careful about running one thing at a time. My thought is to conserve fuel use by being a efficient as possible. I could run a 13k and power everything I have with no worries about overloading it, but the fuel consumption would be a third more.